Drill-socket.



J. W. HARRISON.

DRILL SOCKET. APPLICATION FILED DBO.11, 1911 Patented July 23, 1912.

COLUMBIA PLANUGRAPH C0 WASHINGTON D c JOHN w. HARRISON,

OF WILMERDING, PENNSYLVANIA.

DRILL-SOCKET.

roac es.

To all whom it may concern:

Be it known that I, J 011x Il I'IARRISON, a citizen of the UnitedStates, residing at \Yilmerding, in the county of Allegheny and State ofPennsylvania, have invented certain new and useful Improvements inDrill-Sockets, of which the following is a specification.

My invention consists of an improvement in drill sockets and has for itsobject to provide a positive engagement between the driving head of adrilling machine and the removable bit or drill, with means for facilitating easy and' quick removal of the drill.

The construction is illustrated in the accompanying drawings in which-Figure 1 is a sectional view through the drill head, the rear portion ofthe drill being inserted therein, and partly broken away. Fig. 2 is atransverse sectional view on the line II. II. of Fig. 1. Fig. 3 is aview similar to Fig. 1 at right angles there to, indicated by the lineIII. III., and illustrating the key engagement between the drill and itsembracing bushing. Fig. 4 is a cross sect-ionon the line IV. IV. of Fig.3. Fig. 5 is a sectional detail view indicated by the line V. V. of Fig.2, illustrating the mounting of one of the pressure springs for thedrill embracing bushing. Fig. -6 is a view similar to Fig. 1, showingthe adaptation of the invention to a Morris taper shank drill. Fig. 7 isa perspective detail view of the inner end of such drill. Fig. 8 is asimilar view of the inner end of the bushing for said drill.

In the ordinary connection between drills and the rotating socket orhead therefor, the drill is ordinarily inserted with a taper binding fitand there is usually considerable difiiculty in removing the drill fromits socket therein.

My invention has in view to provide means for separating the bushingfrom the drill longitudinally whereby to lessen its binding engagementthereonand for such purpose the bushing, in rotating driving engagementwith the head, is so constructed as to be capable of being forcedbackwardly against spring pressure for separation, while in the normalconnection and operation of the device it is held in binding enagementwith the drill.

In the drawings illustrating the preferred constructions, the drill head2, generally Specification of Letters Patent. I

Application filed December 11, 1911.

Patented July 23, 1912. Serial No. 665,017.

cylindrical in form, is provided with an inner enlarged base 3 adaptedto be secured in the rotatable head of the drilling machine in anysuitable manner as by a key or set screw. lVithin the head 2 is mounteda cylindrical bushlng 4 in rotative engagement wlth the head 2by meansof interven- 4 ing pins or keys 5, 5, fitted into suitable receivingcavities 6 and 7 respectively of the head 2 and bushing 4. T he cavity 7in bushing 4 is of sufficient length to permit of backward movement ofthe bushing and is normally pressed outwardly by means of a plurality ofsprings 8. Said springs extend into receiving sockets 9 in the rear endof the bushing and bear by their rear ends against the inner face ofhead 3. The drill shank 10 is, as usual, tapered and adapted to fitsnugly within the interior of the bushing 4 and is i by a key 11. Saidkey is fixedly held in the side of bushing 4, in the manner shown inFig. 3, by an off-set riveted terminal 12, or in any other suitablemanner. The bushing 4, having a limited range of longitudinal movement,is retained in its relative position to head 2 by means of a transversekey 12 extending through a socket 13 in head 2 and a registering socket14 in the bushing 4. Said socket 14 is of sufficient length to permit ofthe necessary backward movement of the bushing to relieve it frombinding engagement with the drill shank, having shoulders 15, 16, ateach end, shoulder 15 retaining it against undue outward. movement innormal position to receive the drill shank. The drill shank is insertedin registering engagement with key 11, by its key-way 17, and springs Snormally hold the bushing outwardly. In such position the device is inproper assembled form for operation. When it is desired to remove thedrill for any reason, the outer end of bushing 4 is "tapped backwardlyby a hammer or other suitable instrument, the inner end of they drillshank 10 bearing against the inner face of the head 3. By thisconstruction the bushing is easily separated from binding engagementwith the drill shank which may be then readily removed.

Figs. 6, 7 and 8 illustrate the construction as adapted to the use of atapered drill shank 10 having a flattened terminal 11 which is used inplace of the key 11. In such case the bushing 4 is provided across itsinner end with a transverse recess or held therein against rotationsocket 18, inwardly beyond the main shank receiving cavity into whichextends the terminal 11, when inserted, and which bears against theinner face of the bushing head 2. In other respects the construction andoperation are the same as above described.

lVhat- I claim is:

1. In a drill socket, the combination of a rotatable head embodying anabutment for the inner end of a tool shank, a longitudinally movablebushing in rotatable engagement therewith provided with a gripping andreleasing drill having an opening through its inner end adj acent thesaid abutment, and spring mechanism normally pressing the socketoutwardly from the head, substantially as set forth. 1

2. In a drill socket, the combination of a rotatable head embodying anabutment for the inner end of a tool shank, a longitudinally movablebushing in rotatable engage ment therewith provided with a gripping andreleasing drill socket for a tool shank having a rotating key and anopening through its inner end adjacent the said abutment, and springmechanism normally pressing the socket outwardly from the head,substantially as set forth.

3. In a drill socket, the combination of a rotatable head embodying anabutment for the inner end of a tool shank, a longitudinally movablebushingin rotatable engagement therewith provided with a taperedgripping and releasing drill socket for a tool shank having an openingthrough its inner end adjacent the said abutment, and spring mechanismnormally pressing the socket outwardly from the head, substantially asset forth.

4.. In a drill socket, the combination of a rotatable head embodying anabutment for the inner end of a tool shank, a longitudinally movablebushing in rotatable engagement therewith having a limited range oflongitudinal. 1110\6111611 within the head and provided with a grippingand releasing drill socket for a tool shank having an opening throughits inner end adjacent the said abutment, and a key, and a plurality ofsprings seated in the rear end of the bushsocket for a tool shank ingand bearing against the inner end of the head, substantially as setforth.

5. In a drill socket, the combination of a rotatable head, embodying anabutment for the inner end of a tool shank, a longitudinally movablebushing in rotatable engagement therewith havinga limited range oflongitudinal movement within the head and provided with a gripping andreleasing drill socket for a tool shank having an opening through itsinner end adjacent the said abutment, and a key, and a plurality ofsprings seated in the rear end of the bushing and bearing against theinner end of the head, substantially as set forth.

6. In combination, a rotatable head having a cylindrical cavity andembodying an abutment for the inner end of a tool shank, a cylindricalbushing in said cavity provided witha tapered gripping and releasingsocket for a tool shank having an opening through its inner end adjacentthe said abutment, means providing for rotatable engagement between thehead and bushing and for limited longitudinal movement of the bushingwithin the head, and spring mechanism normally pressing the bushingoutwardly from the head, substantially as set forth.

7. In combination, a rotatable head having a cylindrical cavity andembodying an abutment for the inner end of a tool shank, a cylindricalbushing in said cavity provided with a tapered gripping and releasingsocket for a tool shank having an opening through its inner end adjacentthe said abutment, means providing for rotatable engagement between thehead and bushing and for limiter; longitudinal movement of the bushingwithin the head, spring mechanism normally pressing the bushingoutwardly from the head, and a tapered shank drill. rotatably insertedin said socket, sub-" I stantially as set forth.

In testimony whereof I hereunto affix my signature in the presence oftwo witnesses.

JOHN W. HARRISON. Witnesses C. M. CLARKE, FREDK. STAUB.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents.

Washington, D. C. M

